Automatic train-control system continuous type with track-side energy



AUTOMATIC TRAIN CONTROL SYSTEM CONTINUOUS TYPE A. 5|"!AVER WITH TRACKSIDE ENERGY Filed Dec. 29, 1921 2 Sheets-Sheet 1 QNTROL SYSTEMCONTINUOUS TYPE WITH TRACK SIDE ENERGY A. G. $E-MVEF AUTOMATIC TRAIN 0Filed Dec. 29, l2l 2 Sheets-Sheet 2 game an we n km A Z Shaver a514, Q0m This inventieii TQiZE'iZKES to induc'iiim train mnii'oi systems, andxiwre psi 'iicuieriy '00 m1 iiidllCiEOfi Mei-i1 'QBDiJF-Oi system of thee0i1- iiminus moi sg ieeizii "w ii iiie pri'ii 'ieien .e continuuminduction sysatem arranged in be eenneeieci to mid infiiiencezi by iiiieci: sigimiiing system responsive Lie safety, cmiiien 'emi dengeim'iiciii eeiiiiitiens.

H iiiierioiig the IXlUlE-limp mm objects of my present iiivemiimi ere'ihe pmvisien iii an imine'tiun 0f the ooi'iiimwusi i-ype operative forpi'qdueing e piiimiity 0i iri'ein e0 ii. effeetson ii vehicie such asp'roceeii, 1w i. .i'esiirietwe and stop cheats in my to wi'resipcmdingimiiiic wmiiilions; m/ieiun (if e eeniinuo indueiieii wiemf in which weempieyeci cooperative vehicle and roadside indudtoi'iuiiis energizeaiifrmn e remisiiie source of eiieigy for w per etingz: imin centmiiingzmeans, in predeiei'mined manners; the fuz'tiiev provision 0i. :1 sysiiemof this nature in which a plurality of vehicle energy receiving;imiucioriums c0- upefuie with a. plurality of roadside energytransmitting imincim'inms for differently in'iiuencing a, two eiemenii'eiey epez'aiive for producing ciiii'ereni eiiecizs iii the traineentmiiing: means; and ihe previeien of an iniiiwiion sysiem of thistype in which energized and mnimiied imm a block si neiiing system topi'oduce difierent relative f'ill'lfinil characteristics in saidinciuefiminms 'im' vii'cvtmg the desired operations (if-the tram controlmailin in ,ie accenqi 1&111181'16 0 1e me omg iiiiii such other ebiecis'es imiy hereinafter appear, my mventien consists in the elementsani'i -iheir i'eiatmn one to the other,

es hereimfter particularly ciesci'iberi anci smighi to be defined in theclaims, reference being; had to the accompanying drawing which simws apreferred embodiment of my ii 'ention, and in which Figure 1 is aiiia'vgmi'mnatic view of the track circuits.

Figure 2 is a, diagrammatic View of the vviiicie carriedapparatus andcircuits, and

Figuresi 3. 4, and 5 are diagrammatic views showing various methods ofconnecting capacities with the roadside inductoriums.

iieierring new more in detail to the drawingge and more particularly toFi ml thereof, there are prevideci for each time section or 4 finecircuit 01 'iii) relay Def iiieei'i B the roadside inzlnctm'mms areseiec zrveiy the iength e V mien er i910 being preview, sis is Weiiknewn m the c by dividing); the trawl: by mean. the insuisi'izing g1.Fer iniiiieiiisimg; emi. operating the iirziiiimniwiiii ig meeiimieifi,{he ifidllfiilfii'iififiw E) and Z2 eii e w biocic are eeieciiveiyenergized -m side source 033 a-z'ierg' such the elite? ei'u fenigeiieieixir ii, and ei eeiiti'oiied ic g home anti distant if Brespectively of the new; sueeeer ni construeiieii z'imi arrangementpixie fer the energiwifiioii of the indiimb respenee $30 fee ety,cewiian :MZQ. masioie 00nd; n5,

The imme H eff eiieii ifpiceiit is; E meted as usiiei across the miis ofthe wii) and is energized in the eiieence 0i ii e on tile amid iaieei:ivy "aim. track ilflf l i/iifgi 3M2 elseconnected eei'eee the reiis 01such iiieeiiu The disfmnii'eiey 1U of a given black is gizeci by iimaiiside souree 0i? enemy 1i en is wntreiieci by the home reiey ii. iiibind: in advance, the distant weiey sii given bioek being time mecie m:refie iib iiitioiie of the next miceeeiiixig iii-mix.

.liSGS bet-fiery if, conuetor 12, eoii 0i i: i, eanduetor 11, and Emmi;ceiiteet 352 m: lay mi" the next sueeeciiiig iOiUCii To seieeiiveiyenergize the iiiciuemr b and 72 in respmnse ice treiiic comiiiiei,induceorium b of bleak such i5; :5 5. neat/3d to the generate? Grigiii'migii mcuit comprising the geneiamr G, eencim an 50, 7 and. 6,from contact 41 cmiii'eified. distant relay D (if block EC,(39nfi11-3"01 S5, coii of the ineiuctm'ium if, coniuc'mi 1., (331%denser. 1Q, conductor 3,.Zr0nt cent-ac; 3 1 01 said relay D, andconductors 4, 5., 8 end 51; emi the inducmrium if of said bleak 1 33 ieconnected to the generator ithmugii the "circuit comprising theconductors iii and 8,

J. safeiy tree-k eandiiniens in iaiie in either blocks C or D, the in e5- and 25 of block B-ere ener "h currents of a, given relative phase.fizrther seen that in the event of treclr conditions, as when a. trainthe block D deenergizing the home i t of said block D, the distant relay1 or" block G will be deener izcd and the 31 and 41 controllcf therebywill :2 Elm,-

to close their back contacts, with illthat the circuit connections tothe i b are reversed and the direci on r lies: of current to saidinductorium l c eed, the instantaneous polarity of the at in theinductorium 6 iifering 2st in. the inductorium bf, the currents beingfor example c. If the relay H of block C is decnerin response to dangertrack condius with o train occupying the said block U, the contents 42and 44 controlled by the relsy ll will he opened, with the result that:ductorium I? will be dcenergized.

rile certain construction is shown and l ed connection with the aboveorirgement, I do not wish to be confined to exact emsngement ofcircuits, the main are or the invention residing in the fact thin thereare two inductoriulns, one of which furnishes ener for one coil of 2,two element relay ccrrie on a locomotive, the other which furnishesenergy for the other element of the some relay, all as will herein or hedescribed.

regard to the srrangcment of cepac l circuits, I do not wish to be c theuse of condensers only or to snge'sient of series condensers as thereare other ways of accomthis result, such as indicated in s 3, 4:, and 5,as the condensers may he cred across the main leads to the inducrn inparallel with either winding of v .sn'ie and in case of a high.frequency end. s desire to limit the value of the condenser capacity,then the arrangement as inmost l in Figures 4 and 5 may be used.

in 53 the wiring or circuits for the moving vel' '01s with a portion ofthe roadside apparatus is shown to clearly indicate the operation of thesame. In this figure indicates the two track rails with the inductoriums7/ and b in any section. The 2 inducl'orium F2 is connected to thegenerator by snecnsof the conductors 7 and 8 through the contacts ofrelay H andthe inductorium h" is also munected to the generator throughthe pole changing contacts ill-41 -3 the distant D. is u translatingdevice in form of oltwo element relay carried on o vehicle consisting ofthe elements an and c :corucer of which is connected by conlt sdfi and17 with the coil of a, vehicle i receiving inductorium 101, while themasons element 5 is l4 and with the coil of another vehicle energyreceiving inductoriurn 100, the said vehicle inductoriums' 101 and 100being arranged. for respective cooperation with the '24 and are actuatedto assume and hold the oblique dotted line position. When the relay R-is deenergized, as when the element 0: or Z) is deenergized, thecontacts 24 and 25 will stand in neutral or vertical dotted lineposition.

With this construction it will be seen that counseled through conductorsnormally under safety track conditions, as

when the block ahead and the second block ahead are unoccupied, elementsa and 5 of relay R are energized normally such as with currents of likephase, the inductorium b inducing current into the inductorium while theinductorium b induces current or like phase into the inductorium 101.Under caution track conditions, that is, with the second block aheadoccupied, elements a; and 'b will be energized with currents ofdifferout, such as opposite phase, due to the reversal of direction offlow of current in the inductorium b; and under danger truck conditionswith the block in advance occucontacts 24; and 25 assuming the normal oriull line position, the oblique dotted line position, and the verticalneutral line position under the safety, caution and danger trackconditions resp ctively.

The speed controller S is carried by the vehicle and has two circuitranged thstcne contact will be opened at some predetermined mediumspeed, as some 20 or 30 miles per hour, While the other contact isopened at some low speed, as 8 miles or 10 miles per hour. Assume thatcontact 32 is the medium. speed contact, being opened above thepredetermined speed and closed below that speed and assume also that comtact 33' is the low speed above another medetermined speed and closedbelow that speed.

The magnet M controls the air valve, as particularly set forth in myPatent No. 1,411,526 of April 4, 1922, While the relay l is used only inconnection with the opera tion of a train under predetermined low speed,the some being controlled also by the release key L, and is normallydeenergizcd. When the relay P is energized through the contacts soorcontact, being opened dense key, ii; establishes its own euiiiiireugii iii/u siieir ermieet 36, eperefoien JiT-Ciliiifri are asmagnet fffi swimming the air ralre in its circuit, coni'iueter 2?,reiey' e; i2 2 ceriiiuetors 223 and. 18 battery i5, and eenaiiierere E26and M.

When. i'iewever, secomi biecic ahead is eeuii pieir e iiieib reiey D iniiie block in edreiice ir (ieenergired, their) relay has iis merle inthe rig-iii, ebiiqiie posiiien iiereiiiiieiiere aieseriberi, se time thecireui; relive llliigiii iii. then eompriess confine filer; i27 ema l2%, (:G'Eliiici; 3?; mi smeeri ceriimiier emuiiieior 26., centziei; 0ireiey iii, eoxic'iueiers '3 and 13, iiii'itery B and con riiicizere 2Gand 34;. This circuit 'Wiii be meimeiirieri. iiiitii the train or eitherobstruci'ieri in secmid Meek ahead out of the Wiigg when eutemai-icaiiyiim'cireuitsi wiii be returned in their nermai positions, if theObstruction in the black ahead persists imiii irhe veiiieie preceedsicii'iat Meek then reiey H is ieuncifiao be e m 215% indire- Miriam; is(Tie-e; Deriv ii) r n v rieenerggize 5101i reiey .i 1; iim; (use uponsier arzergiziflieri (rt reiey contacts 23;

2 12 be meirbrei in" air magnet I'wli energized and it" can eni be iiiziie fiplfiilflilimfl eff i is done we aireim 1S em iliCiii p0si-- ewescie ergireii again ,y L When ihilfiti ineiude 259 end ii ii'mgrnet efrelay 1?, reminder 23. CGDI-i'wlii; er relay ii, in

iieri'rrei. ieri made (miy when rehiy ii, is; in rzeeiiergianeiieemiiiimi, conductors 22 and i8, battery B eend irizers 20, 43, and reie key 13, This energizes reiay P and. e relay P is energized Contact5-36 e; esixii'iiishiiig e eireiiii, iiireugii eeri- (iiifiilOi 455,center-i; 36 and. eeriducter 38,

which 5 in miiitipie widi the release key GRYCEAHL us'; described. Remy5: iiiiereii'ore remains .BZRBYjfdZQd emi ii W i remain energzirei' aslong are relayiri is in e ieenergized rmmi in When 1. my 1 1S energized,its

renmmfi 3? is else eieeeri. When reie'y E is AiUJEEFfliZ-Qd the trainmust eiop er travel 13 r er wider the predeterznined,10w speefi, inwhich (511% cnniae'r 33 of speed coiitreiier S is eieseai; iiierefere ifthe rehieie is pre-m (reading M; or umier the pi'erieteriiiinefi lowspeed, eieetremegiiet M ni: rifle valve is energizei tiireugii theTiOiiOWii circuit: 00% duerm e 29 my 30, 0011mm; 55a of speed 0011"ireiier 55, conductor 35, Contact Bi 0% relay mndueter 1i) battery 13,.eondueiore- 20 and 3e iirmnedieteiy; hQWQK QX' when relay H beemneeenergized, iineii ielerR becomes zed end valve megne M beeomesi err-I'er eiriier mermei or medium see i iiepe-miiiigzepmi tiie'position ethe g ring; renteeile 0f the relay D, andreie'gf ii beeswaxiieenergized.

l fe the eperetien 0i: this system,

meme

assume :2 imiii iii bier-k C of Figure 1 eneii a vehicle equip erWi'i'ii this cen'iroi system approaciiing in block B. H in bloek C willbe deenergzizerl so that there wiii. be me energy in indiieinrium b e?iiieek B, consequently relay R, shown in Figure 52, will bedeeriergizeai which Wiii cause may net M to be deeiiergized emiii'ie airbrake on the vehicle Wiii be ap piieii to sin the vehicle. When theveiiicie is reterrieci m the predetermined10w epe ed er ii iii has stopiei, the driver upmi operating reieese key L, the train may premier orunder the XJZB' determined iew speed. Assume Hie-ne eff block D being:Occupied and the moving reiien of finw of energy in the irisiuc'ierimi'ib" of block ii relative to ihefiiireciien of fie r (if energy in theimiiieieriaim F1 ef Said bid 1? is; rewrrseri ijiiereferei referringagain m Figure 2, the reiay hes its 6011i) is mezie iii the rightoblique position, in i eh ease eeziieet the speed eeritreiier S isbrought int/J series; with Irmgi'iei: M ee i'i'iei; ni gne'b M can onlybe energized at 01' be im'v the predetermined speed for which eonizicfr3% is closer}, in which case the irziin iriziy proceed underpredetermined medium speed.

iVhiie Ii iieve Shawn my derieein "the fer-red f0lifl,ii wiii beeppzirent rim many changes and mediiieetiens mey be made in thestructure c'iiseiosed, witheui; deneriingr fmm the of the invention,defined in the feiiewing'cieims.

What I claim as new is:

' 1. Fri a eoritinueus iridue'ti've train Ciflitifii system,the-eembimitiim with theitraek tliif subdivided inte piiirality of'eetiens or 'biecirs, '01? reerisirie meeiieniem comprising plurality0'? parallel indueterimns 'im' eeei-i section or Neck disposedsubsmniieiiy Hie full length 0? the block, a medsicie se zure 0f energy,and. roadside means for the phi raiity ofind ietoriui is of sectienoperebie in reispc-nse t0 @reck cenciition's feremirzect ing one of theinductoriume in eireuii with said seuree 0f energy under safety meekcondifrions end-for (iiseo nnezzting the same under danger trawl:conditions.

In 2. continuous inductive train cmih-oi eysiem, theeumbinatibii ivitiithe track raiis subdivided into a plurality of sections or bineks, ofroadside mechanism comprising:

iiiien eelitroi reiey W die iii? , of energy,

continning the flow of current in one of said inductoriums underpredetermined conditions lo a continuous inductive train consystem, thecombination with the track rails subdivided into a plurality of sectionsor blocks, of roadside mechanism comprising plurality of parallelinductoriums for each section or block disposed substantially the fulllength of the block, a roadside source of energy, andmeans operable inresponse conditions for reversing circuit connections from said sourceof energy to one of said inductoriums, and additional means alsooperable in response to roadside conditions for breaking circuitconnectionsfrom said source of energy to one of said inductoriums.

4a. In a continuous inductive train control system, the combination withthe track rails subdivided into a plurality of sections or blocks, ofroadside mechanism comprising a plurality of parallel inductoriums foreach section or block disposed substantially the full length of theblock, a roadside source of energy, and means for connecting the saidsource of energy to one of said inductoriums operative to reversecircuit connections therebetv een,

a continuous inductive train control P system, the combination with thetrack rails J subdivided into a pluralityof sections or blocks, ofroadside mechanism comprising a plurality of parallel inductoriums foreach section or block disposed substantially the full length of theblock, a roadside source and means for connecting the source of energyto the inductoriums opera-' tive to reverse circuit connections to oneof said inductoriums and to break circuit connections to one of saidinductoriums. the said comprising a pole changer and a make and breakdevice.

in an induction train control systermthe combination with two parallelinductoriums paralleling" the traclrway. a roadside source of energy forsaid inductoiiums, a home re; lay and a distant relay, and circuitconnections between said source of energy and said inductoriumscontrolled by said relays. In an induction train control system, thecombination with of parallel inductoriiuns paralleling the trackway. aroadside source of energy for said inductoriums a home relay and adistant relay for each set of inductoriums. the distant relay of one setbeing controlled by the home relay of another set, and circuitconnections between said source of energy and said inductoriumscontrolled by both said relays of a given set. 8. In an induction traincontrol system, the combination with two parallel induc-1' toriumsparalleling the trackway, a road side source of energy, means forconnecting said source of energy to one of said inductoriums operativefor breaking circuit connections therebetween, provisions for corenecting said source of energy to the other of said inductoriuznsoperative for reversing circuit connections therebetween, a home relaycontrolling the operation of said means,

and a distant relay controlling the operation of the said provisions.

9. In an induction train control system, the combination of sets ofparallel inductoriums paralleling the trackway, one set for each sectionor block of the track, a roadside source of energy for saidinductoriums, means connecting an inductoriuin of one set to said sourceof energy operative for breakingcircuit connections therebetween,provisions for connecting the other inductoriurn of a set to said sourceof energy for reversing, circuit connections therebetween, home anddistant relays for each set, the home relay controlling the operation ofthe said means and the distant relay controlling the operation of thesaid provisions, and circuit means for controlling the distant relay ofone set from the home relay of other set,

10. In an inductive train control system, the combination with the trackrails subdi-- vided into a plurality of sections or blocks, of roadsidemechanism comprising a plurality of inductcriunis for block, a roadsidesource of energy, and roadside means connecting said source of energy tosaid inductoriums operable in response to track conditions for changingthe circuit connections for reversing the direction of flow of currentinone inductorium relative to the other and for discontinuing the flowof current in one of said inductori'ums under predetermined conditions.

11. In an inductive train control system, the combination with trackrails subdivided into a plurality of sections or blocks, of roadsidemechanism comprising a plurality of inductoriums for each section orblock, a roadside source of energy, and means connecting said source ofenergy to said inductoriums including provisions for reversing circuitconnections to one of said inductoriurns and provisions for breakingcircuit connections to one of said inductoriuins in response to trackconditions.

12. In an inductive train control system, in combination, a plurality ofroadside inductoriun'is, a roadside source of energy therefor, a homerelay and a distant relay, and circuit connections between said sourceof energy and said inductoriums controlled by said relays,

13. In an inductive train control system, in combination, sets ofinductoriuins, a pluality in each set, a roadside source of encoperatiyeeach section or v enmgy therefm', means for gizmg sax mducmmur from$21161 source;

" of energy, plurality 0X mducmn'iumfi 02.1

my v

21 hams relay 01 t" acne? Pied by a vehicle gcopsratien with 6'1 Ah)conmzctiims betw "I madside inductm-iums, a vehicle central m wrgy andzmi i imhicmailuns conmemm; and two element; re'my wanes-had t0 3mducticm. train comtmi system, producing seisctively dififamnbefiecis insaid a plumiity of madsirl'a intrain comm maans upon the selesafiive warmzuisizie. source 0.5 energy gimtian of said roaside industoriums. F5

"mztimg said source MI energy 19. In an induction train control system,indmvtmiums opera-7% 5501' in combination with track x-avils subdividedw I Quit wzmecians threbetvven, into insulated secinisnsgfluiocks, atwin con-- i; sommaswing said smxme (:33 an taro}. mama, & 'zxansla ingdevice or produs- We 0512167391? mi. imimtm'iums opering selectivelydifferent efiects in the train y Eavmsing circuit cwn ectien; thera-00mm] means, a plurality of "vehicle induu- 7 home miay aofitroliing thfi flpemtorciums connect-2d to differently infiwmcu m.em1s,and a Riimmmmy consaid, translating device and operative fur npm'aiu'ion of saidpmvisionsv producing difierent effacis therein upon a1 an inductivetrain mum system. wring oi" file imammamous pohrity 0f the sew-1mm nwith'tmck mils subcilvide murrena in am inuctoriu'm wlaxisive i0 film;

hu'a'lity 0f seaions biofilm, 01?. in the, other, a, plurality ofrcldside indu'c nachanism comprising a plurality mriums for each secticnor block: of the trash 2 5m. each sectima 01' black, nonpemfing with thevehicle i111dmix)rsiflwuvms;

'19 02% energy, and means (19 11- a roadside source of #enwgythersefo'r, M103 was. 05f ene gy to induc- -means 2301* connecting thesaid. source of @numa i.:. c3.uwlng provisions for mversing erg'y to thesaid roasida inductoriums opermanna-actions 50 011% 0% said inductoif'kwaive for altering the insiantaneous polarity mi pmvisinns for breakingcircuit 0031- 0f the current in we of saicl inductmriums 3:3? midi'inductoriums in. mrelative t0: that in the uthem l condiians, hams anddis- 20, In an indmtian train central system,

s gash Mack, ivhe distant Why a train'control means, a apeed circuit cam5 ike ogaemtian 0f: first menmailer a two elemenfi relay, 2, plumlity m3:wisions the heme rah mnvehide indu'cwriums csnnected to am eke" mtian0f said ascend men ments 0f the relay, plurzsliiby of moperm- 3% v 1 inroaclside inductoriums arranged in psm xnbiz'miion with @ililk mils subalfei l imdi fl 3? gm y?? 3, l'gagigide,

mwi'z nkbed sec'sism 91. blocks, sem'ce 01? Query and madside mwns fm'ive33 dilithe 'aadsi a imirmamiums g lact-ively means, a energlm thesame- :finr s-ak-zcfiiw mp6 n of the relay in infiueme 3119.. 11mm abmmimeans and n phase aha hit/er unfler 31m mamd swim-Fla tinuous indiuctiantrain can" izrol sysfitem, a csmwi mews a, apcud H sircuit. writa'ollmga tam filament active :1 my when the. mz' emss in zhe aiemenas M's in HWiih $53 31 phase $01 il'ififlifliliflf; fizz: train cz'mqtzrai dlwiimumtecfi sec m or Mes-131m means and; when the currents Zifis in phasetwin rszramoi means; 2;; WE) .J cmrieii 'QWO for placing the iimincantmi meals under afhameni ra fining seieciiwly the control of thespeed conwfiier, plum 11 n it 0f vehicle 'inchzctmiums cmmectsa t0- '2mm @iemems, plmaiiik-y of madsid inrluctm'iums amzm'iged. in. parallellongi 111531324111 1 (if @112 read, a mmiside somrca of ex ;y', and sfor changing cimui; mil ivlafiimls beiween Said reuuz'ce 01% energy amthe zruadside im iuctmiums to vat-1v ilhfi z'elaiien 0 5 "the currents'thereifi.

in an inductive mm comm}. zsystem wmbizyztion with (the was}; mils subiiM irfm 2-, phn'wliiynf fifmns 01" blocks $WLBi5W fi0.. g':isi.1g 22plmvimch ssaciim or block, a roadsie: soui'cc of anercg and roadsidemeans connecting said source of energy to said inducizoriums operable inrespouse to track conditions for modifyin ihe circuit connections forreversing the d1 rcction of. flow of cui'rcntin one of said inductoriumsrelative to tbs other and for oliscomfiinuing the flow of current inoneof mid inductoriums under predetermined condiiizionsi 23. In aninductive train control system, the combination with vidcci into a,plurality of sections or blocks, of roadside mechanism comprising apiuraL iiy of parallel inductoriums for each scction or block, aroadside source of energy, and roadside means operable in response toroadside conditions for i'eversing circuit connections from said sourceof energy to one, of said. iiiduc'oi'iums, and additional .mccns alsoopcmbic response to roadsidc conditions for breciiircig circuitconnections ixom said source of energy so one (if-said infiiicioi'iums,

24k. in am iiaciiicivivc train control system, comoinctioo Wifiii iimcrack rails subdiizx ao a piumiity of sections or blocks, of i'oodsioicmcchciziszin comprising a plum iiy of pcrciici imiuoicriums fog" eachsection or biock, rccdside source of energy moi for commenting the saidsourcc ,cn rgy io one of acid inductoriums oper miwo co rovers-c circuitconnections therebchwccn.

in on inductivc t-mio. wmfcroi sys'cm, ch 5 combizmoion mo i'axiissubdithe track rails sub iivided into a plurality of o: of roadsiemechanism comprisk' ity of parallel inductoriums J37 t-ion or block, aroadside source and means for connecting the so the inductoriums operacircmt connections to one oi riumia and to break circuit cor of saidinductoriums, said. m pole changer and a mo vice.

26. In a continuous induci'ivc troi system, the combimfiion w 3 miissubdivided into a, plui'aiity c or blocks, of roadside mach *lEiF-J' inga piu raiity of parallel; each section or block, a road energy, andmeans for connc source of energy to one of 21 1o mo operative to rcvomccircrlit thcrcbsiawcem 27 In a continuous imiucii troi system, thecombimiioo v mils subdivided into c. plum T 01 or Mocks, of roadsidemocha ing a, plurality of parciici in each section or block, a roadscncrg and moons for connecting of energy to the inductoi-iums L reversecircuit connections m om; de'lctoz'iums and to break circuii cm to oneof said inductoriums, the comprising a pole changer and brook device.

In tcstimon whereof I m AiiOHIBALD G. L

